Interested in Breast Cancer?

That is just one of the myths about breast cancer dispelled by Dr. Kristi Funk in her new book, “Breasts: The Owner’s Manual.”

“I love busting myths with science because, you know, there are enough things to worry about that do cause breast cancer,” Funk said on “GMA.” “I like to take a load off and let you know what does not cause breast cancer.”

“There will always be senseless cancers that happen in someone who is young or someone who does everything right," Funk said. "But for the vast majority, a solid 80 percent, of these cancers around the world, it does make sense and it doesn’t come from your family."

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In this undated stock photo, a nurse is giving a young women a mammography exam.

She added, “It comes from the daily choices that women are making that have to do largely with nutrition and lifestyle behavior.”

You can safely forget about getting breast cancer from these 6 things, according to Funk.

2. Get to an ideal body weight: "And stay there for the rest of your life. Do not be overweight or obese."

3. Exercise: "You've got to bust a move like five hours a week."

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Two women running, in this undated stock photo.

4. Limit alcohol: "No more than one drink a day."

4 ways to lessen your exposure to environmental toxicities, according to Funk.

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The cover of "Breasts: The Owner's Manual: Every Woman's Guide to Reducing Cancer Risk, Making Treatment Choices, and Optimizing Outcomes," by Kristi Funk.

1. Wash your hands frequently, and always before you eat.

2. Dust and vacuum.

3. Have house plants.

4. Funk believes in choosing household-cleaner and personal-care cosmetic products that are chemical-free and [that] use essential oils instead of synthetic fragrances, as the role of various chemicals in cancer risk is still not well understood.